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Finger prints on a piece of paper may be...

Finger prints on a piece of paper may be detected by sprinkling flourescent powder on the paper and then looking it into

A

dark-light

B

sun-light

C

infra-red-light

D

ultraviolet light

Text Solution

Verified by Experts

The correct Answer is:
D
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RESONANCE-ELECTRO MAGNETIC WAVES-Exercise
  1. The electromagnetic waves used in the telecommunication are

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  2. An em wave going through vacuum is described by E=E0sin(kx-omegat) B...

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  3. Finger prints on a piece of paper may be detected by sprinkling floure...

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  4. The displacement current flows in the dielectric of a capacitor when t...

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  5. Which of the following are not electromagnetic waves ?

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  6. if lamda(v'),lamda(x) and lamda(m) represent the wavelengths of visibl...

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  7. The frequency of a light wave in a material is 2xx10^(14)Hz and wavele...

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  8. The electric and magnetic field of an electromagnetic wave is

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  9. The velocity of electromagnetic radiatior in a medium of permittivity ...

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  10. The electric field part of an electromagnetic wave in a medium is repr...

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  11. Which of the following statement is false for the properties of electr...

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  12. The electric field on an electromagnetic wave in free space is given b...

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  13. The velocity of all radiowaves in free space is 3xx10^(8),//s, the fre...

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  14. Which of these statement is false:

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  15. Infrared spectrum lies between

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  16. A man can take pictures of those objects which are not fully visible t...

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  17. The electromagnetic radiations are in descending order of wavelength i...

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  18. Maxwell's equations describe the fundamental laws of

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  19. Heat radiations propagate with the speed of

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  20. The curve drawn between velocity and frequency of a photon in vacuum w...

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